kiddo 6.0.0-alpha.2

A high-performance, flexible, ergonomic k-d tree library. Ideal for geo- and astro- nearest-neighbour and k-nearest-neighbor queries
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51

use std::arch::aarch64::*;

use crate::dist::distance_metric_neon::{NeonF32LeafOps, NeonF64LeafOps};

pub struct ChebyshevNeonF64LeafOps;

impl NeonF64LeafOps for ChebyshevNeonF64LeafOps {
    #[inline(always)]
    unsafe fn dist_k0_f64x2(delta: float64x2_t) -> float64x2_t {
        vabsq_f64(delta)
    }

    #[inline(always)]
    unsafe fn dist_kn_f64x2(acc: float64x2_t, delta: float64x2_t) -> float64x2_t {
        vmaxq_f64(acc, vabsq_f64(delta))
    }

    #[inline(always)]
    fn dist_k0_f64x1(delta: f64) -> f64 {
        delta.abs()
    }

    #[inline(always)]
    fn dist_kn_f64x1(acc: f64, delta: f64) -> f64 {
        acc.max(delta.abs())
    }
}

pub struct ChebyshevNeonF32LeafOps;

impl NeonF32LeafOps for ChebyshevNeonF32LeafOps {
    #[inline(always)]
    unsafe fn dist_k0_f32x4(delta: float32x4_t) -> float32x4_t {
        vabsq_f32(delta)
    }

    #[inline(always)]
    unsafe fn dist_kn_f32x4(acc: float32x4_t, delta: float32x4_t) -> float32x4_t {
        vmaxq_f32(acc, vabsq_f32(delta))
    }

    #[inline(always)]
    fn dist_k0_f32x1(delta: f32) -> f32 {
        delta.abs()
    }

    #[inline(always)]
    fn dist_kn_f32x1(acc: f32, delta: f32) -> f32 {
        acc.max(delta.abs())
    }
}